Rotary pump with easily removable rotor



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ROTARY PUMP WITH EASILY REMOVABLE ROTOR Filed June 7, 1945 5Sheets-Sheet 3j Zzwezzzor/ C'ary fmur Feb. 22, -1949. C, A, NAMUR2,462,214

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Feb. 22, 1949. c. A. NAMUR 2,462,214

ROTARY PUMP WITH EASILY REMOVABLE ROTOR Filed June '7, 1945 5Sheets-Sheet 5 I l l l I 'L Patented rennais-19 ,l l 2,452,214 UNITEDSTATES param omas cialty Brass Company, Incorporated, Kenosha,

Wis., a corporation oi Wisco substituted for abandoned applicationSerial No.

373,358, January 6, 1941. This 7, 1945, Serlal N0. 598,059

application June Claims. (Cl. 1413-205) end to provide the annularbracket I5 into which the casing B is fitted.

The casing B comprises the inboard head I8 and the outboard-head I1. Theinboard head I8 An object of the invention is to provide a pump of therotary type in which the parts are in accurate relation and alignmentand which at the 'same time permits of easy and convenient dismantlingand reassembly for cleaning. Another object is to provide a pump whichwill accommodate substantial liquid pressures without leakage andwithout the additional wear usually associated with higher pressures.Another object is to provide a pump of the rotary type in which thecylindrical surface swept by the impelling means is not interrupted byinlet and outlet ports, thus to produce a more uniform flow of liquidthroughout the pumping cycle and avoid irregular wear of the surfaces.provide in a pump of this character improved impeller mechanismemploying a spacing member for keeping the impeller blades always inproper position with respect to the surface being swept. Still anotherobject is to provide impeller mechanism employing resilient spacingmeans for the blades, thus to compensate for wear on the various parts.A further object is to provide a. rotary type pump which is moreeilicient and which is sturdy and positive in its operation. Still otherobjects and advantages will appear after the following description inwhich one embodiment of the invention is described in detail.

In the accompanying drawings, Figure l is a longitudinal verticalsectional view of one form of the improved pump fully assembled; Fig. 2,

l.an elevational view showing the outboard end of the pump; Fig. 3, aview as in Fig. 2 but with the clamp, outboard head of the casing, andpulley removed; Fig. 4, a horizontal sectional view taken as indicatedat line dof Fig. 3 and showing the outboard head in place; Fig. 5, adetail perspective view of the spacer element; and Fig. 6, a detail viewshowing the shaft nut and rotor retaining nut assembly at the end of thedrive shaft, the view being taken as seen from line 6-6 of Fig. l.

As illustrated, A designates a frame; B, a casing structure providingthe liquid enclosure; C, liquid impelling mechanism within theenclosure; and D, mechanism for driving the impelling mecha- Anotherobject is to.

has a cylindrical wall portion I8 and a rear end portion- I8, the outerperiphery being cut away at 20 to provide a seat against the bracket I5.

A pin 2| in bracket I5 ,engages a socket 22 in head I8 to hold the headin the correct angular position.

The outboard headl Il has near its outer edge a chamfer corner 23, andthe'rim 24 of the inboard head portion I8 extends into this chamfer. Theedge 25 of rim 24 is beveled so as toV provide an annular space for thegasket 28. The gasket 26 is triangular in cross section, and'increasedpressure from within the casing tends only to press it more rmly intothe converging walls retaining it, thus to provide a tighter sealbetween I the inboard and outboard heads.

A clamp 55 extends about the casing and has its ends hooked over thebracket I5. \At' the center of this clamp is a screw 56 which whenturned down presses against the center of the outboard head l1, thus atthe same time holding the casing within bracket I5 and holding the headsof the casing together insealed engagement.

A wear ring 21 is contained within the inboard head I6, and the interiorcylindrical surface 28 of this ring is the surface swept by theimpelling mechanism in the operation of the pump. Wear ring 21 has itsinboard end abutting the end portion I9 of the inboard head and has itsoutboard end abutting the outboard head I1. Ring 21 is slightly longerthan the interior of wall I8, so

- that as the outboard head I1 is pressed inwardly,

this ring is held tight and secure against rotation within the casing.At the same time, the resilient gasket 26 provides an adequate sealbetween the two heads.

As shown more clearly in Figs. 3 and 4, the casing structure B isprovided with inlet and outlet ports. The interior of tube 30communicates with the channel 3i in head portion I8 outward of wear ring21. Channel 3| extends into the end-pass channel 32 about the inboardend of ring 21 and also into the channel 33 about the outboard end ofring 21. Thus, when tube 30 is used as a liquid inlet, the incomingliquid passes into channel 3i and simultaneously through channelsv32 and33 into the interior of the Wear ring 21.

Similarly, the interior of tube 35 communicates msm c. with the channelas in the wan ns, and this chan- The frame A may be of any suitableconstrucnel connects with channels 31 and 38 extending tion and. as hereshown, includes a base I0 and respectively around the inboard andoutboard an outer shell I I into which is received the inner ends of thewear ring.

shell I2 which carries the ball bearings I3 and Tube 30 'may be theinlet and tube 35 the out- I4. The outer shell II is formed at itsinboard let, or tube 35 may be the inlet and tube'30 the outlet,depending on 3 which' is rotated. Tne/impeuer mechanism c includes anannular rotorfelemcnt Il whiclris carried on the rotor directionthe'impeller back plate 4I. Element 4l has a cylindrical outer 5 surfaceand contains a center cavity-ll having preferablya cylindrical surface4l coaxial with the outer surface. Rotor 4I is mounted for rotationwithin wear ring 21 and is eccentric with respect to the axis of ring 21so that at one po t its outer surface approaches the surface of e wearring but near a diametrically opposite point these surfaces are amaximum distance apart.

A plurality of slots Il* extend radially through Moabit greater is theemciency of the seal for shutting oi! possible leakage from the casing.

In operation, the pump is driven by power ,applied at pulley Il. Theshaft It in turn drives the rotor ll. and the space 80, between'therotor and the wear ring, is caused to .move about the casing from inletport to outlet port.v The blades also move along' with the rotor memberand sweep the liquid in front of them. As the blades rotate, the spacerI moves along with them, and it also permits movement of the blades withrespect to itself. The rounded inner edges of the rotor Il; in theembodiment shown, four such L slots are employed, but more or less maybe used as desired. Rotorblades I2 extend through the slots 4I, theirouter ends engaging the surface 28 of wear ring 21, and their inner endsextending into the hollow center of rotor 4I).

A spacer Il is disposed within cavity Il and its surface engages theinner ends of each of the blades 42 so as to maintain these blades intheir proper positions, with the outer ends contacting the wear ring.This spacer is cylindrical and is unattached to any part. Its axis ispreferably the same as the axis of the wear ring 21. It maybe a solidcylindrical piece or it may be tubular. However, it should preferablyhave a resilient surface, and in the embodiment shown it takes the formof a split ring, the ring being expansible so that as the surface ofwear ring 21 or the ends of the blades l2 become worn, the spacer ringexpands to yet maintain the blades in proper contact with the wear ringsurface. If desired, the spacer may be provided with a reinforcing coremember.

The driving mechanism D includes the hollow shaft Cil which is carriedfor rotation in the roller bearings I3 and Il. The driving end of thisshaft extends through wall I9 of the casing B and is adapted to receivethe hub 48 of lthe rotor Il. This hub preferably has a slight 'taper sothat as it is drawn into the end of the shaft, a tight accurate ilt iseffected. At one side, the hub 4l has a channel 41 which is traversed-by the pin il as the hub enters the shaft. Attached to the hub 4l is arotor rod B2 which may be secured by having its end screwed into atapped hole in the end of the hub. The rotor rod l2 extends through thehollow of shaft and has its extended end threaded and engaged by therotor retaining nut B3 which bears against the end of the shaft. The hub46 has a taper at the point where it meets the shaft which has a similartaper, these tapered surfaces helping to center the hub and rotor backplate l I.

A drive pulley S5 is mounted on shaft Il and secured to the shaftsuitably by means of the key Il, and a pulley lock nut 81 is screwed onthe end of the shaft. The nut 81 is provided with a ange B8, and therotor retainingnut 83 is equipped with the ears 89 which extend aboutthis flange. With nut 63 so engaged, it is held from movement axially ofthe shaft.

, An elcient liquid -seal is maintained between 6 the casing plate I9and the rotating elements so as to prevent leakage of liquid betweenintermoving surfaces. This sealing means includes the retaining ring 10,the resilient ring 1I, the ring bearing 12, and the resilient ring 13.The construction and operation of such sealing means is. described indetail in my copending application, Serial No. 226,999, filed August 26,1938 now abandoned. It is sufficient to state here that the greater isthe pressure of the liquid, the

blades help during such intermovement to maintain constant spacing sothat the outer ends of the blades are at all times in the proper contactwith the wear ring. When a resilient spacer is used, any Wearpn'eitherthe ends of the blades or on the wear ring or on spacer surfaces iscompensated by expansion of the spacer.

When, for example, the rotor is driven clockwise, as seen in Figure 3,the liquid enters the pump through tube 20, passes ilrst into thechannel II, then simultaneously through channels I2 and 23 into thespace SII within the wear ring 21. Upon completion of the stroke, theliquid within the wear ring is forced out simultaneously throughchannels 31 and IB into the channel 30 from which it passes out throughtube 35. When the rotor is driven in the other direction, the flow is inthe opposite direction through the same channels.

By having the entering and leaving liquid pass around theblade-contacting surface instead of through it as in the usualconstruction, a sub` u stantlal advantage is gained. In ordinary conuthis break in the surface causes unequal wear,

producing pockets in the wearing surface. With the present construction,the blades at all timesy contact only a uniform unbroken surface, andthe inlet and outlet ports are at practically their full opening duringthe entire pumping cycle.

By having the liquid proceed simultaneously about each end of the wearring into the pump interior and then simultaneously about each end ofthe ring on its way out,the liquid pressure on each end of the rotor issubstantially the same, and in this way the improved constructioneliminates end thrust on' the rotor due to liquid pressure.

The improved pump is particularly useful in connection with milk, otherliquid foods, and in any application where sanitation is of importance,since this pump is very easily dismantled for cleaning.

To take the pump apart, it is necessary only to loosen and remove theclamp 55 by turning the screw 5B (this loosens the outboard head), andthen turn the rotor retaining nut 63 to push the rotor hub 4S from itsengagement with the shaft 60. This frees the rotor and also the inboardhead and sealing rings. Thus, with twovery simple movements,substantially all the essential parts of the pump are loosened and madeavaillable for cleaning and inspection or replacement of parts.

Since the engagement of ears 69 on retaining nut 63 prevents movement ofthis nut axially of the shaft, rotation of this nut can serve only topush the rotor rod 62 endwise, forcing the rotor hub 46 to move directlyendwise out of engagement with the shaft 6U. Thus, a very closelyfitting joint is provided which, with the means provided, can be verysimply and easily disengaged.

The reassembly of the parts can be accomplished in reverse order to thedismantling procedure just described. However, it may be pointed outthat in securing the rotor to the shaft it is not possible, in apreferred embodiment of the invention, to assemble the parts with therotor hub in the wrong angular position. The rotor rod 62 is preferablyjust long enough to extend through the hollow shaft 60 and engage therotor retaining nut 63 only after the channel 41 on the hub has comeinto register with the pin 6i of the shaft and the parts have movedaxially partly into position. Then turning of the retaining nut 63 drawsthe hub positively into close iitting relation with the shaft,` thusinsuring accurate movements of the parts and more eillcient operation.

The fact that the wear ring 21 is held positively between the heads ofthe pump is also an advantage, since this engagement prevents rotationof the wear ring and at the same time the heads are held positively atthe same uniform spacing.

This enables the rotor to be closely tted with a minimum of spacebetween the outboard end of the rotor and the outboard head, and noallowance need be made, as in the ordinary constructions, for varyingthickness of a gasket.

While in the foregoing description, I have set forth one structure inconsiderable detail for the purpose of showing an embodiment of theinvention, it will be understood that the details of such structure maybe varied widely by those skilled in the art without departing from thespirit of my invention.

I claim: 1. In a pump structure providing an impeller chamber, a pumpimpeller mounted in said chamber and equipped with a rear plate and ahub extending rearwardly from the plate, a hollow shaft for saidimpeller' mounted for rotation within said pump structure and receivingvthe hub of said impeller plate, means fixed to said shaft for rotatingthe same, said hollow shaft being provided at its rear end with anoutwardlyextending retainer ange, a rod received within said hollowshaft and fixed to said impeller plate hub, said rod having an outerthreaded end, a wheel provided with a groove receiving said flange ofthe hollow shaft and being provided centrally with a nut receiving thethreaded end of said rod. and a closure for said chamber axially alignedwith said rod.

2. In a pump structure, ahollow shaft rotatably mounted therein, saidstructure providing an impeller chamber open at its forward end, animpeller within said chamber and provided with an impeller plate havinga hub slidably received within the end of said hollow shaft, a keycarried by said shaft and engaging a slot extendingV along said hub andopening at the rear thereof, an impeller rod xed to the hub of saidimpeller plate andhaving a threaded end at its rear, a collar carried bysaid hub for spacing the same centrally within said hollow shaft, awheel mounted at the rear end of said pump structure and providedcentrally with a nut receiving the threaded end of said rod,interlocking means carried by said'wheel and pump structure forrotatably supporting said wheel upon said structure, and aremovableclosure supported inthe forward end of said pump chamber toclose the same.

3. In a pump structure providing an impeller chamber open at its forwardend, an impeller Ain said chamber and provided at its rear with animpeller plate equipped with a rearwardlyextending hub, a hollow shaftrotatably mounted in said pump structure and having its forward endreceiving said hub, key and groove means releasably locking said hub andshaft together, a rod fixed to said hub atA one end and having its otherend threaded, a rotatable wheel equipped centrally with a nut receivingthe threaded end of said rod, cooperating means carried by said wheeland pump structure for rotatably confining said wheel upon saidstructure, and releasable closure means closing the forward end of saidchamber in axial alignment with said rod, said wheel when rotated in onedirection advancing said rod axially to remove said closure and exposesaid impeller for cleaning.

4. Ina pump structure providing an impeller chamber open at its forwardend, an impeller in said chamber and provided at its rear with animpeller plate equipped with a rearwardly-extending hub, a hollow shaftrotatably mounted in said pump structure and having its forward endreceiving said hub, key and groove means releasably locking said hub andshaft together, a rod fixed to said hub at one end and having its otherend threaded, a rotatable wheel equipped centrally with a nut receivingthe threaded end of said rod, cooperating means carried by said wheeland pump structure for rotatably confining said wheel upon saidstructure, and releasable closure means closing the forward end of saidchamber in axial alignment with said rod,

said wheel when rotated in one direction advancing said rod axially toremove said closure and expose said impeller for cleaning, and whenrotated in the other direction being eifective for moving the impellerinwardly within said chamber.

5.. In a pump structure providing a chamber open at opposite ends, ahollow shaft rotatably mounted in said structure and extending throughone end of said chamber, packing supported about said hollow shaftwithin said chamber, an

impeller mounted in said chamber and provided with an impeller plateclosing the space in front of said packing, said plate being providedwith a hub received within said hollow shaft, a rod fixed to said huband extending through and beyond said hollow shaft, said rod beingprovided with a threaded portion at its rear, a member rotatably securedupon said structure and equipped centrally with a nut receiving thethreaded end of said rod, and a closure member movable axially -inalignment with said rodand releasably secured upon said pump structure.

CARL A. NAMUR.

REFERENCES CITED The following references are of record in the f-eofthis patent:

UNITED 'STATES PATENTS Date

